Derek Chisora will face former world heavyweight champion Deontay Wilder in London in April in his 50th career fight.
Chisora, 42, said last year he would retire after a 50th bout which would take place overseas.
But BBC Sport understands the Briton has instead chosen to take on Wilder in London on 4 April.
The pair were due to fight 13 years ago but Wilder withdrew from the fight after an arrest for domestic violence prevented him from travelling to the UK.
Wilder lost his WBC title in two defeats by British fighter Tyson Fury in 2020 and 2021, while Chisora was beaten by Fury in 2022.
Wilder was once considered the division’s most feared puncher but has struggled to regain his aura since his trilogy with Fury.
The 40-year-old’s stock plummeted after back-to-back stoppage defeats by Joseph Parker in 2023 and Zhilei Zhang in 2024.
After more than a year out, the American returned in June with a low-key seventh-round stoppage of little-known Tyrrell Anthony Herndon.
Yet despite his fall from grace, Wilder has still been heavily linked with a potential fight against unified champion Oleksandr Usyk – should he beat Chisora.
Chisora, meanwhile, is enjoying a late-career resurgence with a three-fight winning run, including points victories over Joe Joyce and Otto Wallin.
He had been linked with a third bout against long-time rival Dillian Whyte or a possible shot at WBO champion Fabio Wardley.
Fury has backed Chisora to win the fight and thinks it should be for a title.
He said: “There should be a belt on the line. You’ve got two legendary fighters here.
“A world champion with 10 title defences from the USA, and an absolute warlord from the United Kingdom.”
